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Thread: Discovery 1 V8 1997 Viscous Fan

  1. #1
    Join Date
    Apr 2008
    Posts
    63

    Discovery 1 V8 1997 Viscous Fan

    Hi

    I have read a lot of threads on here regarding the viscous fans for different landrovers and I'm not sure of the differences. My truck is a D1 V8 97 stock configuration and mainly highway driving.

    I'm wondering if my viscous fan is operating correctly and would appreciate some advice.

    Two years ago I replaced the viscous clutch, the new part was a Borg Warner from a reputable supplier. The original clutch had been on the truck since new and was leaking. At the same time I replaced the engine coolant and thermostat. Since then I am not aware of any engine overheating and the factory temp gauge hasn't risen above just under halfway (which seems to be how it works from what others have said).

    Testing today: When the truck is cold from standing overnight and engine off, I can move the fan freely, although it does have some minor resistance, but not a lot. When I start the car cold the fan does not roar. When the car is hot after going for a drive and engine off, I can move the fan freely also.

    Do you think the fan on my V8 is working correctly or not. If not, why would I only get two years or less from a Borg Warner part ?

    Also should the coolant be changed after two years, or do modern coolants last much longer ? I'm using Ethylene Glycol, (Nulon Premium Long Life coolant) at 50/50 concentration.

    Thanks for the help.

  2. #2
    Join Date
    Feb 2009
    Location
    Moe
    Posts
    1,308
    If no roar with a bit of a rev from cold, I would say your coupling is shot.
    Long life coolant should be fine for a few years yet, depending on the condition of your galleries at the last change.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Detroit(R) Nanocom

  3. #3
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    12,247
    Look it is not ironclad re the roar on start up.
    Depends on a lot of things.
    Imho the best test is to block off the radiator and Chechen the core temp in front of the fan.
    The fan should lock up at 94 c approximately.
    you will know when it locks up.

    regards PhilipA

  4. #4
    Join Date
    Apr 2008
    Posts
    63
    Ok thanks for the replies.

    What I think I will do is connect up my ECUmate then drive around until the engine gets hot and up some hills and see what temps are being reported to the ECU from the coolant sensor.

  5. #5
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    12,247
    Well that is not the full story as the vc engagement depends pon the temperature of the air passing through the radiator core onto the spring on the front of the vc

    An infrared temp tester on the rad is best as some rads block in front of the Vc although if your temp is normal then should be OK

    The aux fans also come on at 102 from a sensor on the thermostat

    Best test is to have an accurate temp gauge and see the actual engine temp. They are available on eBay for 20 dollars or so.
    regards PhilipA

  6. #6
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    12,247
    Duplicate
    regards PhilipA

  7. #7
    Join Date
    Apr 2008
    Posts
    63
    Thanks for all the feedback.

    I have run some tests with the ECUmate.

    For normal driving around town and up hills the ecu shows coolant temp around 89C. When the engine is switched off after a run it rises to 93C and drops when restarted. Canít get the coolant temp above 93C so far. This temp is too low to engage the viscous fan, based on what others have said. Will try again to engage the fan on our next very hot day.

    As an unrelated observation, the ecu had stored a fault from previous driving. 15 - Fuel Temp Sensor. I have cleared this fault and will see if it comes back in the future. No faults at present.
    The ecu is currently reporting the fuel temp in the high 50s.

  8. #8
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    12,247
    That is pretty well perfect including the heat soak to 93 c.

    the VC hardly activates with normal driving, but on a hot day on sand you will know whether it is working.

    regards PhilipA

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